linux-kernel - [PATCH] drm: amdgpu: Use the correct size when allocating memory

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Message-Id: <20200809203406.751971-1-christophe.jaillet@wanadoo.fr>
Date:   Sun,  9 Aug 2020 22:34:06 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     alexander.deucher@....com, christian.koenig@....com,
        airlied@...ux.ie, daniel@...ll.ch, sumit.semwal@...aro.org,
        colton.w.lewis@...tonmail.com, Ori.Messinger@....com,
        m.szyprowski@...sung.com, bernard@...o.com,
        dri-devel@...ts.freedesktop.org
Cc:     amd-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] drm: amdgpu: Use the correct size when allocating memory

When '*sgt' is allocated, we must allocated 'sizeof(**sgt)' bytes instead
of 'sizeof(*sg)'. 'sg' (i.e. struct scatterlist) is smaller than
'sgt' (i.e struct sg_table), so this could lead to memory corruption.

Fixes: f44ffd677fb3 ("drm/amdgpu: add support for exporting VRAM using DMA-buf v3")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
index 134cc36e30c5..0739e259bf91 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
@@ -462,7 +462,7 @@ int amdgpu_vram_mgr_alloc_sgt(struct amdgpu_device *adev,
 	unsigned int pages;
 	int i, r;
 
-	*sgt = kmalloc(sizeof(*sg), GFP_KERNEL);
+	*sgt = kmalloc(sizeof(**sgt), GFP_KERNEL);
 	if (!*sgt)
 		return -ENOMEM;
 
-- 
2.25.1